Coming up on this Christmas Eve, "Piers Morgan Tonight" welcomes Pastor Rick Warren of Saddleback Church to the program.

Welcoming his guest for a primetime interview, Piers Morgan asks the American evangelical Christian pastor and author his opinion on Christianity in America and its influence on politics.

"I think, also, I think during the last decade, the term "Evangelical" became not a theological term, but a political term," says Warren.

"And a lot of people were turned off by the politics," explains Warren. "They say, well, everybody knew that President George [W.] Bush was a 'Evangelical.' They say, 'oh, then you must be in favor of the Gulf War.'"

And although Warren agrees with Morgan that "you've got to separate church and state," he also offers the following counterpoint: FULL POST